Roll third_party/icu/ 53f6b233a..2ecd66c69 (4 commits)

https://chromium.googlesource.com/chromium/deps/icu.git/+log/53f6b233a41e..2ecd66c696c4

Created with:
  roll-dep third_party/icu

TBR=dsinclair@chromium.org

Change-Id: I4fcaadc71515d0b6a68ae3257c5ff990c57203a7
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/61252
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
diff --git a/DEPS b/DEPS
index 2cbfe92..01549b1 100644
--- a/DEPS
+++ b/DEPS
@@ -22,7 +22,7 @@
   'depot_tools_revision': 'e90e5fe206c98bf7ade94f6831ed6ace48c1f5fa',
   'freetype_revision': '839a023619b593b742f62ffab8e7e4f9da8c1593',
   'gtest_revision': '3a45039862471cc2785e92bd19bd146c70344986',
-  'icu_revision': '53f6b233a41ec982d8445996247093f7aaf41639',
+  'icu_revision': '2ecd66c696c46e255cd634d3175b1072f4499949',
   'instrumented_lib_revision': 'b1c3ca20848c117eb935b02c25d441f03e6fbc5e',
   'jinja2_revision': 'b41863e42637544c2941b574c7877d3e1f663e25',
   'jpeg_turbo_revision': '38c693569427129fd8c22f4bba67685d7e176094',